Signaling system



y 1933. H. CHASE 1,919,007

SIGNALING SYSTEM Filed Aug. 21, 1931 2 Sheets-Sheet l CENTRAL OFFICESUBSCRIBER'S 6'4 PLANT INVENTOR L. H CHASE BVJ-Z 771m: mw

ATTORNEY y 18, 1933- H. CHASE 1,919,007

SIGNALING SYSTEM Filed Aug. 21, 1931 2 Sheets-Sheet 2 nmmu 5-! -Ew mm. ama 1 III] .IIIIIIHlHzIIH ////////7 III/IIIIIIIIJ /NVENTOR L. H CHASE a9Iac QMMM ATTORNEY n ll/l/l/l //////////77W7//// Patented July 18, 1933UNITED STATES PATENT OFFICE LELAND H. CHASE, 01? LITTLE NECK, NEW YORK,ASSIGNOR TO HOLMES ELECTRIC PROTECTIVE COMPANY, OF NEW YORK, N. Y., ACORPORATION OF NEW YORK SIGNALING SYSTEM Application filed August 21,1931.

This invention relates to signaling systems and more particularly to asignaling system adapted for use in premises to be patrolled.

The object of this invention is to supervise from a central station thepatrolling of protected premises.

A feature of this invention resides in the provision of means forsignaling from a central office to a. watchman in the protected premiseswhen it is time for him to begin making his tour of the premises.

Another feature resides in the provision of means for signaling backfrom the protected premises to the central office when a startingimpulse has been given to indicate to an attendant at the central officethat the starting impulse has been sent from the cen tral office andreceived at the protected premises.

Another feature resides in the provision of means for automaticallyallotting a predetermined time interval for a watchman to reach asubstation and attend to apparatus thereat.

Another feature, which reduces traffic on a register, resides in theprovision of means for automatically sending a signal to the centraloflice only when a watchman is delinquent in arriving at a substationand attending to apparatus thereat or when certain unstandard conditionsoccur in the system.

Another feature resides in the provision of recording means at thecentral office which makes a record only when a watchman is delinquentor when certain unstandard conditions occur in the system.

Another feature of this invention lies in the provision of means forconditioning from a preceding station apparatus at a substation forattendance by the watchman. This feature makes necessary the visiting ofsubstations in proper sequence.

Another feature resides in the provision of means whereby a watchman maysend an emergency call to the central oflice when aid is required.

Still another feature resides in the provision of means for testing thesystem from the central office and for sending a code sig- Serial No.558,436.

nal from the protected premises back to the central office to indicatethe condition of the system.

Other features including the separation into groups of the variouspieces of apparatus and the provision of protective means such, forinstance, as traps and networks located within and between the variousgroups which when disturbed or tampered with will automatically causethe operation of signals at the central ofiice are disclosed in thisspecification.

In watchmens signaling systems it is the usual practice to have awatchman signal in from each substation visited and to have a recordingdevice at a central ofiice make a record each time a watchman sends insuch a signal.

In the present invention a starting signal is given to notify a watchmanthat it is time to begin his tour of the premises. A time spacing deviceis automatically set in operation to space off a predetermined timeinterval allotted the watchman to reach the first substation in histour, and apparatus at the first substation to be visited is set incondition for attendance by the watchman. If the watchman fails to reachthe first substation and attend to apparatus thereat within thepredetermined time limit, a code signaling device is automaticallybrought into operation to send a code signal to the central office. Uponthe sending of the code signal a record ing device at the central officeis automatically brought into operation to make a delinquency record. Ifthe watchman arrives at the first substation and attends to theapparatus thereat within the predetermined time limit, the apparatus atthe next substation to be Visited is for attendance by the watchman andthe time spacing device is automatically operated to prevent the sendingof the code signal and to begin spacing off a new time interval allowedthe watchman to reach the next substation and attend to apparatusthereat. Appa ratus at the first substation is automatically set incondition for attendance by the watchman when the starting signal isgiven. The apparatus at each succeeding substation automatically set incondition is automatically set in condition for attendance by thewatchman, by the watchmans attendance to apparatus at a precedingsubstation.

In the drawings, Fig. 1 is a schematic of a complete system;

Fig. 2 is a plan View of the time spacing device;

Fig. 3 is an end elevation taken on the line 33 in the direction of thearrows in Fig. 2;

Fig. 4 is a side elevation of the traveller and trip magnet thereforshown in the lower left hand portion of Fig. 3; and

Fig. 5 is a side elevation of a code wheel and cooperating contactstaken on the line 55 in the direction of the arrows as shown in Fig. 2.

The system is divided into two main parts, a central office and asubscribers plant, which, as shown in Fig. 1, are connected by the linewires A and B. Control of the ap paratus in the subscribers plantportion of the system is accomplished from the central office over theline wire B and this connection between the central office and thesubscribers plant will be referred to in this specification as the Bcircuit. Code signals indicating delinquencies of the watchman in theperformance of his duty and signals indicating unstandard conditions inthe system pass from the subscribers plant to the central office overthe line wire A, and this connection between the central office and thesubsoribers plant therefore will be referred to in this specification asthe A circuit.

At the central office are the following: A.

secondary clock 201 which controls the sending of a starting impulse tothe subscribers plant, a comparatively high potential battery 220 tosupply a high potential negative impulse to a polarized relay at thesubscribers plant, a comparatively high potential battery 279 to supplya high potential positive impulse to the polarized relay at thesubscribers plant under certain conditions, a recording device 250 torecord delinquencies in the watchmans visits to the substations, abuzzer signal 256 to audibly indicate delinquencies, lamps to indicatevarious conditions occurring in the system, and the necessary keys andrelays to control the operation of the different signal elements.

At the subscribers plant are a local battery 31, a starting signaldevice 62 to notify a watchman that it is time to begin his tour, thesubstations to be visited by the watchman, an emergency station throughwhich emergency signals may be sent to the central office when aid isrequired. a selector switch with connections to the various substationsand the time spacing apparatus which automatically spaces off the timeintervals allowed the watchman to travel from one substation to another.

A suitable enclosure is provided at the subscribers plant to house theselector switch and protect the switch from tampering with by thewatchman or any unauthorized person.

irn enclosure is also provided at the subscribers plant to house thetime spacing device and protect this apparatus against tampering with bythe watchman or any person unauthorized to have access to the apparatus.

An enclosure is also provided at the sub- ;cribers plant to house thelocal battery employed to energize the selector switch, the time spacingapparatus and the associated relays. The enclosures referred to areindirated by broken lines in Fig. 1.

Located within the enclosures at suitable places are protective contactsand networks to autmnatically cause the display or sounding of signalsat the central oflice when any of the apparatus in the protective systemis disturbed or tampered with. These protective contacts and networksare of the type usually en'pioyed in burglar alarm or like protective"ems, and are so placed in the line circuits the system at thesubscribers plant the eni at the central ofliee tl'iat any .nce ordisconnection of the wires at the o ected prei ises or opening of theenclosures housin the various pieces of apparatus will result in theoperation of signal devices at the central oiiice.

The selccto witch has six banks of contacts and a co. .ponding number ofdoubleended wiper arms attached to a common shaft. The shaft is rotatedand the wiper arms are successively driven over the contacts uponrelease movements of the stepper mag net. The No. 1 bank serves as alocking bank to lock in a relay serving to connect into the system atthe subscribers plant the local battery. The No. 2 bank provides a meansof connection between the local battery and the lamps at the varioussubstations. The No. 3 bank provides a connection to ground for thestepper magnet of the selector s itch during its first operation,connections for obtaining successive operations of the stepper magnet tomove the wiper arms to select the first substation and connect-ions forobtaining successive operations of the stepper magnet to move the wiperarms from the bank contact representing the last substation in thesystem to the normal position for the iper arms of the selector switch.The No. l bank provides a means of connection between the local batteryand jacks at the substations through which ground connection may becompleted for the operation of a stepper relay which assists in theoperation. of the stepper magnet under certain conditions and completesa circuit to a trip magnet employed to prevent sending of a code signalwhen the substations are v'sited in proper sequence and within thepredetermined time limits. The No. 5 bank provides a means of connectionfrom the system at the protect d premises to a finish indicatorat thecentral oiiice. The No. 6 bank provides a means of connection betweenthe local battery at the protected premises and a start indicator thecentral ofiice.

The time spacing apparatus operates continuously during the tour by the"-w'atchman of the protected premises and operates to send a code signalto the central oli'ice at the end of a predetermined time intervalunless reset by the watchmans arrival at a substa tion and attendance toapparatus thereat within the predetermined time interval.

' The time spacing apparatus comprises a motor, a shaft driven thereby,a spring restored contact-making traveller driven by a threaded cylinderon the shaft,;a trip magnet to trip the traveller and allow itto bereturned to starting point by the restoring; spring, a shaft bearing acode Wheel and a contact closing cam, a clutch to couple the two shaftsand a clutch magnet to operate the clutch.

The substations in the subscribers plant are numbered 1 to 17 inclusiveand each contains a lamp signal 61 and a jaclr G l. The lamp insubstation 1 is lighted automatically when the starting signal for-thewatchman is operated. The lamp in the second substation is lighted whenthe watchman extin guishes the lamp in the first substation Eachsucceeding substation lamp is lighted in turn by the watchman s arrivaland attendance to apparatus at the preceding substation.

ere are twenty-three contacts in each bani: of the selector switch. Thefirst contact in each bank is designated as N. The remaining contactsare numbered l to 22 inclusive.

A brief description of the operation of the system will. now be given.

At the hour and minute on which the watchman is to begin to make histour, a time impulse is sent over the B circuit from the central officeby means of a clock contact. This impulse operates polarized relay 23 inone direction to close the start contact 24- momentarily. The closing ofthis contact operates local battery relay 25 which operates to providebattery for the apparatus at the protected premises. As soon as thisbattery is applied the motor 33 starts to drive the elapsed timemechanism, and stepper magnet 32 of the selector switch operates. Uponrelease by the polarized relay 23 of the start contact 24 the steppermagnet 32 is dcenergized and the wiper arms of the selector switch movefrom the No. 20 contacts in the respective banks to the No. 21 contacts.A circuit is thereupon completed for local battery relay 25 through theN o. 1 bank. Relay operates and locks in to supply battery to theapparatus at the protected premises. The stepper magnet 32 is thensuccessively energized and deenergized to move the wiper arms to the No.1 contacts in the respective banks.

When the wiper arms of the selector switch reach the No. 1 contacts, thelamp at station No. 1 lights and a starting signal 62 operates to notifythe watchman that it is time for him to begin his tour. The watchman isawakened by the gong 62 and goes to station 1 where he inserts a plug 49momentarily in the jack 64. The plug i9 which is preferably carried bythe watchman for insertion in the jack 64 serves to conductively bridgethe contacts of the jack and may be of any desired form providing itwill perform this func: tion. As soon as the plug 49 is inserted in thejack 64, the trip magnet 84 will energize and the traveller 79 isrestored by its restoring spring to normal position. Should the watchmanleave the plug 49 too long in the jack, the dash pot relay 125 willfunction and close its contacts to cause energization of the clutchmagnet 99; this causes the code wheel 93 to revolve and to send a signalover the A circuit to the central ofiice. Upon removal of the plug 49the selector moves its wiper arms from the N0. 1 segments in therespective banks to the No. 2 segments and the watchman proceeds tostation 2. Thus ateach station he moves the selector to the segmentconnected to the station head. Ateach station a light indicates that theselector has functioned and he mustput the light out. At his finalstation the selector is restored-t0 the No. 20 segments in therespective banks by the No. 3 bank and as it reaches thisposition groundis cut off relay 25 which removes battery from the system. At theoperation of each station the traveller 79 is restored to normal. I

The traveller '79 consists ,of an arm which is moved along by a pinriding in a thread 01"" a screw that is revolved-by the motor. At theend of the screw are contacts 80 which when closed cause the clutchmagnet 99 to become energized. Whenthe trip magnet 84; is energized thetraveller 79 is lifted from the screw and returned to normal by aspring.

The clutch magnet 99 is energized upon closing of the contacts 80 by thetraveller 79. Normally the code Wheel 93 is at rest but is set-inrotation to send a code signalto the central ofiice upon operation ofthe" clutch magnet 99. Contacts 120 and-121 are the operation of aregister 250 at the central, Contacts 132 close as soon as the office.wheel starts to revolve and the closing :of

these contacts holds power onclutch mag, In series with clutch'inag'net99is net 99. relay 109 whose contacts close to hold power on the motor33 through one revolution of the code wheel. Thus if contacts are openedafter the code wheel starts to revolve the code will be completed.Further, if the code is COlYllJnglll as the selector is restoring and'battery is'c'ut from the motor 33 thorugh the No. 1 bani-1 the code willcomplete itself. The clutch magnet 99 is a slow-release magnct to allowcontacts 132 to open properly. If contacts 80 are closed by thetraveller 79 before thewatchm'an arrives at a substation, the clutchmagnet 99 is operated and the code wheel 93 is in rotation to send adelinquency signal to the central office to caus the operation oft-heregister 250. #The emergency station is located along the-line of thetour as a means for the watch mah'to. sendin a signal to the centraloflice at any time during the tour. The jack contacts of this station be'conductively bridged by 'a'plug 49 inserted in the jack by thewatchman. When thejack contacts of this emergency station areconductively bridged by the plug 49, the clutch magnet 90 is enorgizedand the code wheel 93 iscauscd to revolve' to send a code signal tocentral oflice. Other stations such as buttons or footrails may beconnected to this station so that the apparatus may be used a a holc'lupalarm during the open hours of a protected premises. *"A fulldescription of the operation of the system will now be given. At" t'hecentral ofiice the secondary clock 201 operates on minute impulsesreceived over the conductors 202 and 203 from a suitable sourceofcurrent 204, under control of a controlling device designated as 205which may be operated from any suitable score of current supply such asthe generator 206. The

secondary clock 201 has a set of fixed contacts 207, 208, 209 and 210and a movable contact 211. The fixed contacts 207, 208, 209 and 210represent quarter-hour time intervals and maybe connected into thesystem as desired. When the movable contact 211 engages one of thesefixed contacts which has been connected into the system, such forinstance as contact 207 a circuit is closed over the conductors 212 and213 to relay 2 14. Relay 214 closes a circuit to relay 215 as follows:ground, battery 216, armature and front contact of relay 214, conductor217, lower left hand inner contacts of key 218, conductor 21-9, Windingof relay 215 to ground. Relay 215 through its left hand armatureconnects into the B circuit a comparatively high potential battery 220,to send a comparatively high'potential negative impulse over the Bcircuit and conductor to operate polarized relay 23 at the subscribersplant. Relay 215 also through its right hand armature closes a circuitfor impulse indicator lamp 221 which is lighted to indicate the sendingof the impulse which conditions the system for operation. This circuitis as follows:

ground, battery 222, winding of buzzer relay 223, conductor 224,conductor 225, right hand armature of relay 215, contact226, conductor227, winding of relay 228, conductor 229, impulse indicator lamp 221,conductor 230, lower ri ht hand inner contacts of key 218, conductor231, back contact and armature of difierential relay 232, conductor 233,back contact and armature of relay 234 to ground. Relay 228 locks up tohold battery on the impulse indicator lamp 221 until the differentialrelay 232 is operated from the subscribers plant to close a circuit tothe tour indicator lamp 235. So long as the impulse indicator lamp 221remains lighted, it 1 indicates that the starting impulse has been sentto the subscribers plant and has not as yet caused sufficient rotation.of the wiper arms of the selector switch to bring about operation of thestart signal device and the lighting of the lamp at the firstsubstation. The lockin -in circuit through relay 228 may be traced asfollows: ground, battery 222, winding of buzzer relay 223, conductor224, con ductor 225, armature and front contact of relay 228, winding ofrelay 228, conductor 229, impulse indicator lamp 221, conductor 230,lower right hand inner contacts of key 218, conductor 231, back contactand armature of differential relay 232, conductor 233, back contact andarmature of relay 234t0 ground.

Polarized relay 23 upon receiving the start impulse pulls up its lefthand armature to a start contact 24 and closes a circuit to localbattery relay 25 as follows: ground, conductor 26, left hand armature ofpolarized relay 23, start contact 24, conductor 27, con ductor 28,winding oflocal battery relay 25, conductor 29, conductor 30, localbattery'31 to ground.

Local batteryrelay 25 pulls up both its right and left hand armaturesand closes two circuits, one including the stepper magnet 32 I of theselector switch and the other including the motor 33 of the time spacingapparatus.

The wiper arms 34-, 35, 36, 37, 38 and 39 of the selector switchnormally engage the No. 20 contacts of the respective banks.

When the start contact 24 is closed by the operation of polarized relay23 and the local battery relay 25 operates to connect into the systemthe local battery 31, a circuit is closed to the stepper magnet 32 ofthe selector switch as follows ground, local battery 31, conductor 30,conductor 29'. left hand armature of local battery relay25, contact 40,conductor 41, conductor 42, conductor 43, conductor 44, winding ofstepper magnet 32, conductor 45, conductor 46, the No. 20 contact ofrestoring bank No. 3, wiper arm 36, 1 contact of the No. 3 bank,conductor 4 to ground. The circuit just described remains closed and thestepper magnet 32 energized for the brief period the start contactremains closed. The" wiper arms of the selector switch, however, are notmoved from engagement with the No. 20 contacts of the respective banksuntil this circuit is broken. Upon release by the polarized relay 23 ofits left hand armature and opening of the start contact 24, the localbattery relay 25 becomes deenergized, the left hand armature of localbattery relay 25 is released from contact 46 and the circuit to steppermagnet 32 is opened. Upon the de energization of stepper magnet 32 theWiper arms move to the No. 21 contacts of the respective banks.

By movement of the wiper arms of the selector switch to the No. 21contacts of the respective banks, a"locking circuit for the localbattery relay 25 is completed. The circuit established is through theNo. 1 bank and is as follows: ground, local battery 31, conductor 30,conductor 29, winding of local battery relay 25, conductor 28, conductor43, bridged contacts of the No. 1 bank, wiper arm 34, N contact of theNo. 1 bank, conductor 47 to ground. WVith this circuit as tablishedthrough the No. 1 bank, the local battery relay 25 is again energizedand locks in to maintain the local battery 31 in the system.

Local battery relay 25 for the second time completes circuits to thestepper magnet 32 and the motor 33 respectively. The circuit to themotor 33 is as follows: ground, local battery 31, conductor 30,conductor 29, left H hand armature of local battery relay 25, contact40, conductor 41, contact 50, right hand armature of local battery relay25, ronductor 51, conductor 52, motor 33, conductor 53, conductor 54,terminal 55 to ground. The

motor circuit thus established is maintained during the watchmans tourof the premises.

The time interval between the first and second closing operations of themotor circuit is so short that the motor does not have time to stop butcontinues to operate during the brief period in which the circuit isopen.

The motor therefore, carries over the brief period in which the localbattery relay 25 is deenergized.

Stepper magnet 32 is energized. over the following circuit: ground,local battery 31,

conductor 30, conductor 29, left hand armature of local battery relay25, contact 40, conductor 41, conductor 42, conductor 43, r'o'nductor44, winding of stepper magnet 32, conductor 45, armature and backcontact 56 cuit for this operation of differential relay 232 may betraced as follows: ground, local battery 31, conductor 30, conductor 29,left hand armature of local battery relay 25, contact 40, conductor 41,conductor 42, conductor 43, conductor 44, conductor 58, conductor 59, Ncontact of the No. 6 bank, Wiper arm 39, contact 21 of the No. 6 bank,conductor 60, line wire of the B circuit, conductor 236, left handarmature and back contact of relay 215, conductor 23?, upper left handspring contact 238 of key 218, upper left hand inner contact of key 218,conductor 239, primary winding of differential relay 232 to ground.Polarized relay 23 does not operate at this time because of thecomparatively high resistance of its windings. Differential relay 232pulls up its armature against front contact 240 and completes a circuitto a tour indicator lamp 235 as follows: ground, battery 241, lower lefthand contact 242 of key 218, spring contact 243, conductor 244, tourindicator lamp 235, conductor 245, front contact 240, and armature ofdifferential relay 232, conductor 233, back contact and armature ofdifferential relay 232, conductor 233, back contact and armature ofrelay 234 to ground. The lighting of the tour indicator lamp 235 at thecentral office indicates that the system is in operation, that astarting impulse has been received in the protected premises and thatthe selector switch is in operation. hen the circuit for energization ofthe primary winding of differential relay 232 is opened by movement ofthe wiper arm 39, beyond the contacts 21 and 22 of the No. 6 bank aswill be later explained, the secondary winding of differential relay 232holds the armature of this relay against front contact 240, and locks into keep battery on the tour indicator lamp 235 for the duration of thetour. The circuit through the secondary winding of this relay is asfollows: ground, battery 241, contact 242, spring contact 243, conductor244, secondary winding of differential relay 232, conductor 245, frontcontact 240 and armature of differential relay 232, conductor 233, backcontact and armature of relay 234 to ground.

The stepper magnet 32 upon being brought into operation over the circuitincluding its armature and back contact 56, and contact 21 of the No. 3bank operates to open the circuit by separation of its armature fromback contact 56. Deenergization of the stepper magnet 32 thereuponoccurs and the wiper arms are moved on the release movement of thestepper magnet to the No. 22 contacts of the respective banks. Steppermagnet 32 is then energized over a circuit including the No. 22 contactof the No. 3 bank. Stepper magnet 32 again operates to open the circuitincluding its armature and back contact 56 and the wiper arms are againadvanced by the release f closes these spring contacts.

movement of the magnet so that the ends of the wiper arms opposite tothe ends moving off No. 22 cs ntacts engage the No. 1 confacts in therespective banks.

lVhcn the wiper arms engage the No. 1 contacts in the respective banks,a circuit is completed through wiper arm 35 and the No. 1 contact of theNo. 2 bank to the first substation lamp 61 and the starting signaldevice 62. The circuit may be traced as follows: ground, local battery31, conductor 30, conductor 29, left hand armature of local batteryrelay 25, contact 40, conductor 41, conductor 42, conductor 43,conductor 44, conductor 58, conductor 59, N contact of the No. 2 bank,wiper arm 35, No. 1 contact of the No. 2 bank, conductor lamp 61, to thesleeve side of jack 64 to ground. Conductor 65 leads from conductor 63in this circuit to the starting signal device 62 which is groundedthrough conductor 66.

Lamp 61 in substation No. 1 is thereupon lighted and the starting signaldevice 62 is in operation to notify the watchman that it is time tobegin his tour of the premises.

'hilc the various movements of the selector switch above described aretaking place, the time spacing apparatus is operating to space off thetime interval allowed the watchman to reach the first substation. Thetime spacing apparatus is driven by the motor 33 which, as shown in Fig.2, rotates a shaft 67 bearing a worm gear 68. The worm gear 68 engages aworm wheel 69 mounted on a shaft 70 on which is a comparatively smallgear 71 driving a larger gear 72 attached to a shaft 73. The shaft 73 iscontinuously driven by the motor 33 through the gear train described andhas on one end a gear 74 and on the other end as shown in Fig. 3 onehalf of a friction clutch 75. The gear 74 engages a gear 76 which ismounted on a shaft 77. On one end of the shaft 77 is a threaded cylinder78 which drives a traveller 79 toward a pair of spring contacts 80.

The traveller 79 is an L-shaped bar piV0tally supported at 81 and 82 asshown in Fig. 4 on the ends of an armature 83 of a trip magnet 84. Thefree end of the traveller carries ;i pin 85 which rests in the helicalgroove of the threaded cylinder 7 8. Upon rotation of the threadedcylinder 78 the free end of the tra eller 79 is driven toward the springcontacts and when moved to full traverse The traveller is shown in Fig.2 in its starting position and is provided with a retracting spring 86to return it to starting position when the trip magnet 84 is energized.The armature 83 of the trip magnet 84 as shown in Fig. 4 pivotallysupported at 87 on one end of a U-shaped member 88 and is returned tonormal position by a spring 89 upon deenergization of the trip magnet84. \Vhen the trip magnet 84 is energized and attracts its armature 83,the traveller 79 is tilted so that the pin on is free end is lifted outof the heli cal groove of the threaded cylinder 78. The retractingspring 86 thereupon swings the free end of the traveller 79 back tostarting position. When the trip magnet 84 is deenergized the spring 89moves the armature 83 to normal position and brings the pin 85 on thefree end of the traveller 79 into engagement with the threaded cylinder78. A set screw 90, adjustably supported in a bracket 91, is provided todetermine the starting point of the traveller 79.

Attached. to a suitably supported shaft 92 is a code wheel 93, aninsulating disc 94, a friction disc 95corresponding to the disc 75carried by the shaft 73, and an annularly grooved collar 96. The collar96 and friction disc 95 are keyed to the shaft 92 and are slidablelongitudinally of the shaft 92 toward the friction disc 75. An arm 97extending from an armature 98 of a slow-torelease clutch magnet 99extends into the annular groove of the collar 96. When the the clutchmagnet 99 is energized it pulls up its armature 98, the arm 97 shiftsthe collar 96 and the friction disc 95 longitudinally on the shaft 92and brings the friction disc 95 into engagement with the friction disc75. The shaft 92 is thereupon driven by the shaft 73 to rotate the codewheel 93 and the insulating disc 94.

It will be seen therefore from the foregoing description and referenceto the drawings that the traveller 79 is started on its movement towardthe contact springs 80 as soon as the starting impulse is sent from thecentral office and will continue in its move ment toward thiscontact-making position unless prevented from reaching this point byoperation of the trip magnet 84.

The watchman upon hearing the starting signal 62 starts out for thefirst substation and upon arriving at the first substation inserts theplug 49 into the jack 64 to conductively bridge the contacts of thejack. Vhen he does so a circuit is completed to stepper relay 100 asfollows: ground, local battery 31, conductor 30, conductor 29, left handarmature of local battery relay 25, contact 40, conductor 41, conductor42, conductor 43, conductor 44, conductor 58, winding of stepper relay100, conductor 101, N contact of the N0. 4 bank of the selector switch,wiper arm 37, No. 1 contact of the No. 4 bank of the selector switch,conductor 102, the tip contact of ack 64, the plug 49 inserted by thewatchman, sleeve contact of jack 64 to ground. Stepper relay 100thereupon operates to pull up both its right and left h and armaturesagainst contacts 103 and 104 respectively.

When the stepper relay 100 is energized a circuit is completed throughits left hand armature and contact 104 to the trip magnet 84 as follows:ground, local battery 31, conduc- ?246. The teeth on the code wheel 93.obvitor 30, conductor 29, left hand armature of local bat-tery relay25, contact 49, conductor 41, contact 50, right hand armature of localbattery relay 25, conductor 51, winding of trip magnet 84, conductor105, conductor 12?, contact 104 and left hand armature of stepper relay100, conductor 106 to ground.

The trip magnet 84 when energized attracts its armature 83 which isattached to the traveller 79 and tilts the traveller 79 so that the pin85 on its free end is lifted from the groove of the threaded cylinder78. The retracting spring 86 then returns the traveller to its startingposition so that when the trip magnet 84 becomes deenergized thetraveller 79 will by means of the spring 89 bearing against the armature83 be moved so that the pin 85 on its free end will rest in the grooveof the threaded cylinder 78. The traveller 79 will then again begin totravel from its starting point toward the spring contacts 80.

If the watchman fails to arrive at the sub station and cause operationof the trip magnet 84 by inserting the plug 49 in acl; 64 before thetraveller 79 presses the spring contacts 80 together, clutch magnet 99will be operated to move the friction disc on the shaft 92 intoengagement with the friction disc 75 on the continuously driven shaft73. The clutch magnet 99 is energized over the following circuit:ground, local battery 31, conductor 30, conductor 108, winding of codeholding relay 109, conductor 110, winding of clutch magnet 99, conductor111, contacts 80, conductor 54, terminal 55, to ground.

When the clutch magnet 99 operates to move the/friction disc intoengagement with the friction disc 75, shaft 92 is rotated and turns thecode wheel 93 and the insulating disc 94. The code wheel 93 operates toalternately open and close the A circuit in accordance with thearrangement of notches in the code wheel.

At the central oflice is the code relay 246 which is normally energizedover'the A circuit as follows: ground, battery 247, wind ing of coderelay- 246, conductor 248, winding of'relay 234, line wire of the Acircult, network 112, and door contact 113, which i are in the enclosurehousing the selector switch, conductor 114, network 115, and doorcontacts 116 which are in the enclosure housing the local battery 31,door contacts 117 and network 118 which are in the enclosure housing thetime spacing apparatus, conductor 119, spring contact 120, contact 121,conduct-or 122, conductor 123, resistance124 to ground. The springcontact 120 is normally pressed against contact 121 to close the circuitto the code relay 246 at the central office. As the code wheel 93revolves the indentations in the periphery of the code wheel 93 allowseparation of the cont-acts 120 and 121 and open the circuit to the coderelay ously close the circuit to the code relay 246 by pressing thecontact 120 into engagement with the contact 121.

Upon the deenergization of code relay 246 the armature of this relayfalls into engagement with cont-act 249 and closes a circuit to recordmagnet 250 as follows: ground, battery 251, winding of tape feed controlrelay,

252, which is a slow-release relay, windings of record magnet 250,conductor 253, lower rlght hand outer contacts of key 218, conductor254, back contact 249 and armature of code relay 246 to ground. Acircuit is also; closed by this release action of code relay 246' tobuzzer relay 223 and open pilot lamp 255 as follows: ground, battery222, winding of buzzer relay 223, conductor 224, open pilot lamp 255,conductor 254, back contact 249- 256 and is energized over the followingcir-' cuit: ground, battery 222, armature and front contact of buzzerrelay 223, conductor 257, night alarm pilot lamp 259, to ground. The

night alarm pilot lamp 259 may be used in conjunction with buzzer 256 ormaybe used separately when no audible signal is required. This lampflashes with open pilotlamp 255 in accordance with code signals but willnot light as does open pilot lamp 255 if there is a permanent break inthe circuit A. The buzzer circuit may be opened by operation of key 258and a circuit completed for a night alarm cut-out lamp 260 which, when;lighted will indicate to an attendant at the board in the centraloffice that the buzzer signal is not being used to indicate thereception of code signals. The circuit to the night alarm cutout lamp260 is as follows: ground, battery 261, night alarm cut-out lamp 260,conductor 262, lower contact of key 258 to ground.

YVith the alternate deenergization and energization of the code relay246 and the consequent alternate closing and opening of the circuit tothe recorder magnet 250, the record- 1 er operates to make a series ofrecords on a tape 263 corresponding to the code notches in the codewheel 93. The recorder may be any suitable recording device but is shownfor the purpose of illustration as a taperecorder having a driven tape263, striker 264 to mark the tape, an anvil 265 under the tape and arecorder magnet 250 to operate the striker. A motor 266 energized by asuitable source of current supply such as a battery 267 serves to feedthe tape 263 across the anvil 265. Attached to the motor shaft is a wormgear 268 which drives a worm wheel 2 69 in a counterclockwise direction.'i he worm wheel 269 is mounted on a shaft 2T0 on one end of which is 7,1 a roller '71 which in contact with one side of the tape of therecorder and serves to draw the tape 263 across the anvil ing againstthe opposite face of the tape to that engaged by the roller 271 is aroller 272 which is frictionally driven by the tape 263 in a clockwisedirection. The roller 272 is mounted on a shaft .73 on one end of whichis a disc 274 engaging a feltcovered wheel 275 which is turned in acouliter-clockwise direction and engages a disc attached to a shaft 28?extending from a roller 2-38 on which the tape 263 of the recorder iswound. The tape 233 is drawnby the roller from a storage spool 27?between two rollers 278 across the anvil 265 and is wound up on theroller 238. The. roller 271 which draws the tape 263 is positivelydriven and the speed o'f-travel of the tape therefore is constant... Thespeed of rotatio of the ro f M 238, however, gradually decreases as thet: 7 builds up onthe. roller because there is suz'l'icient slippagebetween the disc27l, the feltcovered wheel 27 5 and the disc 276 toprevent increase in the speed of the tape due to the building up of thetape on the roller 238. The circuit for the motor 266 is closed eachtime the tape feed control relay is energized. The circuit for themotorbe traced as follows: ground, cattery 261', motor 266, conductor 289,front'contact and armature of tape feed control relay to ground. It willbe obvious that the recorder may be co-mnionto' a plurality ofsubscribers" plants, each having a different code wheel and that recordsmay be made of the different code 401 signals cm'ployed on a commontape.

Assuming now that the watchman arrives at substation No.1 before theexpiration of the predetermined time interval and causes operation ofthe trip magnet 84: before the traveller '79 has travelled far enoughalong, the threaded cylinder 78 to close the contacts 80. The insertionof the plug49 in jack 64c closes the circuit to the stepper relay 109. pThe stepper relay 0 thereupon operates and 551 closes a circuit tosteppe-r magnet 32 as follows: ground, local battery 31, conductor 30,conductor 29, left hand armature of local battery relay 25, Contact 40,conductor 11, conductor 42, conductor 43, conductor winding of steppermagnet 32, front conta and right hand armature of stepper relay 100 toground. Stepper magnet-32 is thereby energized. Stepper relay 100 isalso energized while the plug 49 remains in jac-k 64 at substation 1.When the plug 49 is removed from jack 64 the circuit to stepper relay100 is opened. Stepper relay 100 is deenergized and the circuit tostepper magnet 32 is opened. Upon release of stepper magnet 32 the wiperso -arms areall moved to the N0. 2 contacts in the respective banks Thelamp 61 at substation 1 exting sued. The circuit to the starting signaldevice 62 is opened tli lamp 01 at substation 2 is lighted.

Should the watchman, however, fail to remove the plug 49 from jack 64,dash pot relay 125 would in a comparatively short time operate to closea circuit to clutch magnet 99 and cause the sending of a code signal tothe central ofiice to operate the recording device to make a delinquencyrecord. The circuit to the dash p'ot relay 125 is as follows: ground,local battery 31, conductor 30, conductor 2-9, left hand armature oflocal battery relay 2-5, contact 40, conductor 41, conductor 4-2, conductor43, dash potrelay 125, conductor 126,

conductor 127, front contact 104 and left hand armature of stepper relay100, conduc Dash pot relay 125 opertor 106 to ground. ates to close acircuit to the clutch magnet'99 as follows: ground, local battery 31,conductor 30, conductor 103, winding of code holding relay 109,conductor 110, inding of clutch magnet 99, conductor 128, conductor12-9, contacts 130 to ground. The clutch magnet 99 thereupon operatesshift the friction disc 95 into engagement with the continuouslyrotating friction disc to cause the sending of the code signal to thecentral Whenever the clutch magnet 99 is energized, the code holdingrelay 109 is energized to hold battery on the motor 33 so that once acode signal is start-ed battery will be held on the motor 33 until thecompletion of the code signal. If the local battery relay 25 releasesbefore a code signal is completed, the circuit to the motor 33 will heas follows: ground, 10- cal battery 31, conductor 30, conductor 108,armature and frontcontact of code holding relay 109, conductor 131, backcontact and right hand armature of local battery relay 25, conductor 51,conductor 52, motor 33, conductor 53, conductor 54, terminal 55, toground.

To hold the circuitfor the clutch magnet 99 for one complete revolutionof the code wheel 93, the clutch holding; contacts 132 are maintainedclosed until the insulating disc 9% has made one complete revolution andbrought the peripheral knob 107, into posi tion to separate the contacts132. When once the clutch magnet 99 is operat d and the insulating disc94 is rotated to allow the closing of the clutch holding contacts 132the following circuit to the clutch magnet 99 is maintained for onecomplete cyclic movement of the code wheel 93 ground, local battery 31,conductor 30, conductor 108, winding of code holding relay 109,conductor 110, winding of clutch magnet 99, conductor conductor 133,clutch holding contacts 132, conductor 33 1, terminal'55 to ground.

Assuming that the watchman has visited each substation up to andincluding the sixteenth substation and attended to the apparatus thereatwithin the predetermined time intervals spaced off by the time spacingapparatus and the wiper arms are on the No. 17 contacts of therespective hands, when the watchman plugs into the seventeenthsubstation the stepper relay 100 operates to close the circuit to thestepper magnet 32. When the plug 49 is removed from the jack 64 at thesubstation 17, the stepper relay 100 and the stepper magnet 32 release.The wiper arms are then moved on to the N o. 18 contact of therespective banks. \Vith wiper arm on the 1T0. 18 contact of the No. 3bank a circuit to stepper magnet 32 is completed as follows: ground,local battery 31, conductor 30, conductor 29, left hand armature oflocal battery relay 25, contact 40, conductor 41, conductor 42,conductor 43, conductor 44, winding of stepper magnet 32, armature andback contact 56 of stepper magnet 32, conductor 57, the No. 18 contactof the No. 3 bank, wiper arm 36, N contact of the No. 3 bank, conductor47 to ground. Stepper magnet 32 thereupon is energized and separates itsarmature from back contact 56 and breaks its energizing circuit. Thewiper arms upon release of the stepper magnet 32 move to the No. 19contacts of the respective bands, and (he stepper magnet 32 is againenergized to break its own circuit by separating its armature from backcontact 56. The wiper arms are then moved on to the No. 20 contacts ofthe respective banks.

When the wiper arm 34 arrives on the No. 20 contact in the No. 1 bankthe locking circuit of the local battery relay 25 is opened. Localbattery relay 25 releases its armature and opens the local batterycircuit of the system at the subscribers plant. The system at thesubscribers plant is then in normal condition and will. not be energizedagain until an impulse is sent from the central office to energizepolarized relay 23.

Should the watchman at the subscribers plant at any time wish to summonaid he may send an emergency signal to the central office from theemergency station 135. The apparatus at the emergency station 135comprises a jack 136 and a signal lamp 137. Signal lamp 137 at theemergency station 135 remains lighted during the watchmans tour of thesubscribers plant and is supplied with lighting current from the localbattery 31 over the following circuit: ground, local battery 31,conductor 30, conductor 29, left hand armature of local battery relay25, contact 40, conductor 41, conductor 42. conductor 138, lamp 137 toground. When the watchman wishes to summon aid he inserts the plug 49into jack 136 to conductively bridge the contacts of the jack andcomplete the circuit for the clutch magnet 99 as follows: ground, localbattery 31, conductor 30, conductor 108,

winding of code holding relay 109, conductor 110, winding of clutchmagnet 99, conductor 128, conductor 139, to the tip contact of jack 136through the plug 49 inserted therein to the sleeve contact of jack 1.36to ground. ith this circuit completed the clutch magnet 99 operates tomove the friction disc 95 into engagement with the continuously drivenfriction disc 75. The shaft 92 is rotated and a code signal sent to thecentral otlice in the same manner as when delinquency signals are sent.

To send a code signal from the emergency station to the central oflice,it is not necessary that the lamp 137 be lighted through currentsupplied from the local battery 31 or that the local battery relay 25 beoperated. The watchman may by inserting the plug 49 into the jack 136 atthe emergency station at any time cause the sending of the code signal.

Assuming that aid is required at a time when no tour is in progress andthe local battery relay 25 is deenergized so that the local battery 31is not connected into the sys tem, the watchman by inserting the plug 493 into jack 136 at the emergency station 135 completes a circuit to theclutch magnet 99 and code holding relay 109 as follows: ground, localbattery 31, conductor 30, conductor 108, winding of code holding relay109, conductor 110, winding of clutch magnet 99, conductor 128,conductor 139, tip spring of jack 136 through the plug 49 inserted inthe jack to the sleeve spring of jack 136 to ground. causes operation ofthe clutch magnet 99. It also puts battery on the motor 33 over thefollowing circuit: ground, local battery 31, conductor 30, conductor108, armature and front contact of code holding relay 109, conductor131, back contact and right hand armature of local battery relay 25,conductor 51, conductor 52, motor 33, conductor 53, conductor 54,terminal 55 to ground. The code signal is thereupon sent to the centraloflice and since all code signals are answered by guards sent from thecentral otIice to the subscribers plant regardless of whether the codesignal is an emergency call or a delinquency signal the watchmans callfor aid is imme- T diately answered.

Key 218 is provided as a connecting means between various apparatusparts in the system and normally in the position shown in Fig. 1. Totest the system from the central 1 ofiice without causing operation ofthe selector switch and the consequent operation of the start signalingdevice at the subscribers plant, the key 218 may be operated at thecentral office to connect in a comparatively The closing of this circuitL high potential battery 2T9. lamp 280, conductor 281, contact 282,spring contact 238, con ductor 237, back contact and left hand armatureof relay 215, conductor 236, over the B circuit line wire, conductor140, windings of polarized relay :23. conductor 26 to ground. Onreceiving this positive impulse polarized relay 23 will pull up itsright hand armature against contact 141. and clo e a circuit to theclutch magnet 99 and code holding relay 109 as follows: ground, localbattery 31, conductor 30. conductor 108, wind ing of code holding relayloll. conductor lit). winding of clutch magnet f conductor 12%.conductor 139, contact 141. right hand armature of polarized relayconductor 26, to ground. The operation of the code holding relay 109will put battery on the motor 33 over the circuit including conductor108, armature and front contact of code holding relay 109, conductmf 131and back con act and right hand arn'iatore of local battery relay 25.The operation of the clutch magnet 99 will result in the turning of thecode wheel 93 and the sending of code signals over the A circuit to thecentral oiiice in the same manner as when code signals are sentindieating a delinquency in the watchnians visit to a substation.

Located at the central oilice in the A cir c'uit in series with the coderelay 246 and the protective contacts and networks in th 3 apparatusenclosures in the subscribefs plant is relay 234. This relay may have ahigher resistance winding than the code relay 2-1-6 01 it may have acomparatively heavy armature or spring a rmature held so that the relaywill not be operated by the current normally flowing in the A circuit.This relay therefore does not operate under normal coinlitions. Shouldthe resistance in the A circuit, however, be decreased such as wouldhappen if the A circuit were grounded between the central oflice and thesubscribers plant. or it the protective contacts and networks in theapparatus boxes were bridged around by conductors of low resistance, therelay 231 would operate to pull up its armature against front contact283 and complete a circuit to ground pilot lamp 284. The circuit for theground pilot lamp Q8-i follows ground, battery 222, winding ot buzzerrelay 2223, conductor 224, ground pilot lamp 284. conductor 295, frontcontact 283, and armature of relay Bil to ground. The lighting ot theground pilot lamp 284 would indicate to an attendant at the centraoliice the abnormal condition of the A circuit. The buzzer relay 223would also be operated to switch battery on the buzzer circuit and thenight a arm pilot lamp 259. Buzzer 256 would therefore operate and thenight alarm pilot lamp 259 would be lighted to indicate the abnormalcondition of the system.

Code relay 246 in addition to serving as a means for controllingoperation of the buzzer 256 and the recorder 250 during the reception ofa code signal also serves in connection with the open pilot lamp 255 ameans for indicating an opening in the protective system such as wouldbe caused by severance of the conductors in the A circuit or opening ofany of the door contacts oi the apparatus boxes. Should code relay 246be deencrgized by an opening in the conductors of the A circuit thearmature of code relay 246 will engage back contact 24:) and completethe following circuit to the open pilot lamp 255: ground, battery Q22,winding of buzzer relay 223, conductor 224, open pilot lamp conductor254, back contact 249 and armature of code relay 246 to ground.

At the central ofiice a key 266 is provided so that in case thesecondary clock 201 is not operating or it is desired to make a test ofthe system when the movable contact Qll is not in engagement with one ofthe contacts 207. 208. 209 and 2H), the key 286 may be operated to putbattery 216 in circuit connection with relay 2i?) to send a startimpulse to the polarized relay 23 at the subscribers plant.

'hat is claimed is:

1. In combination. a central station, patrolled premises. a plurality ofsubstations at the patrolled premises, a signal device at eachsub.--itati ')n, a. selector at the patrolled premises having contactsto which said signal devices are connected, a circuit extending from ihecentral station to the patrolled premises and including a relay at thepatrolled preroises to control the operation of said selector to causeit to select and operate the signal device of the first substation, acode circuit extending from the patrolled premises to the centralstation, time controlled means at the central station to close saidfirst circuit, a circuit closed by the operation of said relay andincluding an electromagnetic timing switch at the patrolled premises formeasuring time intervals, said electromagnetic switch closing said codecircuit at the expiration of a certain time interval, means operated bythe patrolman at each substation within a. certain time interval forcausing said selector to select the next substation, operate the signaldevice thereat and reset said automatic time spacing means to preventthe closure of said code circuit.

2. In combination, a central station, patrolled premises, a plurality ofsubstations at the patrolled premises, a signal device at eachsubstation, a selector at the patrolled premises having contacts towhich said signal de vices are connected, a circuit extending from thecentral station to the patrolled premises and including a relay at thepatrolled premises to control the operation of said selector to cause itto select. and operate the signal device of the first substation, a codecircuit ex-.

iii

tending from the patrolled premises to the central station, timecontrolled means at the central station to close said first circuit, acir cuit closed by the operation of said relay and including anautomatic timing switch for measuring time intervals, said timing switchclosing said code circuit at the expiration ot a certain time interval,means operated by the patrolman at each substation within a certain timeinterval for causing said selector to select the next substation,operate the signal device there-at and reset said automatic timingswitch to prevent the closure of said code circuit, a signal at thecentral station operated by the time controlled means, and a relay atthe central station actuated by the response of the selector to rendersaid signal inert.

3. In combination, a. central station, pa, trolled premises, a pluralityof substations at the patrolled premises, a signal device at eachsubstation, a selector at the patrolled premises having contacts towhich said signal devices are connected, a circuit extending from i thecentral station to the patrolled premises and including a relay at thepatrolled premises to control the operation of said selector to cause itto select and operate the signal device of the first substation, a codecircuit extending from the patrolled premises to the central station,time controlled means at the central station to close said firstcircuit, a circuit closed by the operation of said relay and including atiming switch for measuring time intervals, said timing switch closingsaid code circuit at the expiration of a certain time interval, meansoperated by the patrolman at each substation within a certain timeinterval for causing said selector to select the next substation,operate the signal device thereat and reset said timing switch toprevent the closure of said code circuit, a signal at the centralstation operated by the time controlled means, a relay at the centralstation actuated by the response of the selector to render said signalinert, a second signal means operated by said last mentioned relay tooperate said second signal, and means actuated by the patrolman at thelast substation to render said second signal inert.

4. In a watchmans signaling system, a central station, patrolledpremises, substations thereat, a signal device at each substation, aselector having terminals to which said signal devices are connected,time controlled means at the central station for causing said selectorto select and operate the signal device at the first substation, amanual switch at each substation associated with each signal device,means at the patrolled premises for automatically spacing off timeintervals, set in operation by said time controlled means, a delinquencysignal at the central station operated thereby at the expiration of agiven time interval, means actuated by the operation of the manualswitch by the patrolman at the substations within given time intervalsto cause said selector to select and operate the signal device at thenext substation, reset said time spacing means and delay mechanism setin operation by the operation of the manual switch at each substationand operating by failure to operate the switch within a given timeinterval to cause the operation of said delinquency signal at thecentral station.

LELAND H. CHASE.

